Honolulu Fire Department investigators have determined that arson is to blame for a blaze that destroyed a shark tour boat in Haleiwa Harbor early Friday.

The case has now been turned over to the Honolulu Police Department, which has opened an arson case, said HPD spokeswoman Michelle Yu.

The fire on board the 30-foot North Shore Shark Adventures boat was reported at 12:40 a.m. Flames burned the bridge and cabin of the boat and the heat from the fire damaged a nearby vessel, said fire Capt. Terry Seelig.

Damage was estimated at $225,000.

North Shore Shark Adventures is one of two shark-tour operators operating out of Haleiwa that have been the source of constant debate in recent years.